Offer a real x402 service
Your submitted URL must be HTTPS, stable, and gated by a valid x402 payment challenge. Services that collect credentials, trigger side effects, or require unsafe requests are not eligible for unattended probing.
MERCHANTS / 02Listing guidelines
Earn trust on the wire.
Sonar listings are designed for agents that need evidence before they pay. These guidelines keep the index useful and the checks safe.
Make the capability clear
Use a descriptive name and explain the input, output, price, supported network, and important limits. Good metadata helps relevant searches find you.
Pass the initial check
After submission, Sonar checks that the endpoint responds, exposes a parseable payment requirement, and remains safe to probe. Passing creates a Sonar verified badge; it does not guarantee business continuity or settlement.
Keep the contract stable
Listed services receive a dedicated probe schedule. Repeated failures, malformed challenges, unexpected price changes, or unsafe behavior can remove the badge or pause the listing.